U.S. patent application number 17/187233 was filed with the patent office on 2021-06-17 for systems and methods for sanitizing pool and spa water.
This patent application is currently assigned to Hayward Industries, Inc.. The applicant listed for this patent is Hayward Industries, Inc.. Invention is credited to James Carter, Raymond P. Denkewicz, JR., Arthur W. Johnson, III, James Murdock.
Application Number | 20210179454 17/187233 |
Document ID | / |
Family ID | 1000005421391 |
Filed Date | 2021-06-17 |
United States Patent
Application |
20210179454 |
Kind Code |
A1 |
Denkewicz, JR.; Raymond P. ;
et al. |
June 17, 2021 |
Systems and Methods for Sanitizing Pool and Spa Water
Abstract
Systems and methods for sanitizing pool and spa water are
provided. An electrolytic chlorinator is provided which includes a
combined flow, temperature, and salt concentration sensor. The
electrolytic chlorinator could include an acid tank for in-situ
cleaning of the electrolytic chlorinator or acidification of
pool/spa water where needed. A delayed polarity reversal technique
is provided for de-scaling and managing passivation of the blades
of an electrolytic chlorinator. The electrolytic chlorinator could
include a sacrificial anode for protecting components of the
chlorinator as well as other pool/spa components. The electrolytic
chlorinator could include an integral, electrically-controlled acid
generator, a brine tank for periodically superchlorinating and/or
shocking pool/spa water, and/or a plurality of chemical tanks/feeds
for periodically injecting chemicals into the chlorinator. A
combined ultraviolet (UV)/Ozone and salt (electrolytic) chlorine
generator is provided, as well as: filters having integral UV
sanitizers; reflective linings for UV sanitization systems; means
for injecting bubbles into pool/spa water; and a system for
acquiring and analyzing samples of pool/spa water using an unmanned
aircraft (drone).
Inventors: |
Denkewicz, JR.; Raymond P.;
(East Greenwich, RI) ; Johnson, III; Arthur W.;
(Stoughton, MA) ; Murdock; James; (Wakefield,
RI) ; Carter; James; (Warren, RI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hayward Industries, Inc. |
Berkeley Heights |
NJ |
US |
|
|
Assignee: |
Hayward Industries, Inc.
Berkeley Heights
NJ
|
Family ID: |
1000005421391 |
Appl. No.: |
17/187233 |
Filed: |
February 26, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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15927412 |
Mar 21, 2018 |
10934184 |
|
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17187233 |
|
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62474333 |
Mar 21, 2017 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
Y02W 10/37 20150501;
C02F 1/78 20130101; G01N 33/182 20130101; C02F 1/4674 20130101;
G01N 33/0052 20130101; C02F 1/325 20130101; C02F 2103/42 20130101;
B64C 39/02 20130101; C02F 2001/46119 20130101; B64C 2201/12
20130101 |
International
Class: |
C02F 1/467 20060101
C02F001/467; G01N 33/18 20060101 G01N033/18; G01N 33/00 20060101
G01N033/00; B64C 39/02 20060101 B64C039/02 |
Claims
1. A sanitization system, comprising: an electrolytic chlorinator
having a plurality of electrolytic plates for generating free
chlorine from salt through electrolysis; and means for in-situ acid
cleaning of the plurality of electrolytic plates, said means
injecting an amount of acid into the electrolytic chlorinator based
on at least one of chlorinator run time or pool size.
2. The system of claim 1, wherein the means for in-situ acid
cleaning comprises an acid tank and tubing in fluid communication
between the acid tank and the electrolytic chlorinator, the acid
tank and the tubing injecting acid from the acid tank into the
electrolytic chlorinator for in-situ acid cleaning of the plurality
of electrolytic plates.
3. The system of claim 1, wherein the means for in-situ acid
cleaning performs in-situ acid cleaning of the plurality of
electrolytic plates during a periodic cell cleaning cycle.
4. A sanitization system, comprising: an electrolytic chlorinator
having a plurality of electrolytic plates for generating free
chlorine from salt through electrolysis; and a sacrificial anode
positioned in a chamber of the electrolytic chlorinator, the
sacrificial anode mitigating against galvanic corrosion damage to a
pool or spa component.
5. The sanitization system of claim 4, wherein the sacrificial
anode comprises a removable plug removably positionable within the
chamber of the electrolytic chlorinator through an aperture formed
in the electrolytic chlorinator.
6. The sanitization system of claim 4, wherein the sacrificial
anode is formed from zinc.
7. A sanitization system, comprising: a filter for filtering pool
and/or spa water; and an ultraviolet sanitization system positioned
within the filter for sanitizing water within the filter.
8. A method of controlling operation of a salt chlorinator,
comprising: sensing at least one variable comprising one or more of
a salt level, a water temperature, or an electrical current using a
sensor of a salt chlorinator; and controlling operation of the salt
chlorinator and a filtration system supplying water to the salt
chlorinator based on the at least one variable.
9. The method of claim 8, further comprising modifying chlorine
dosing by the chlorinator based on weather or geographic
information.
10. The method of claim 8, further comprising controlling polarity
reversal rates of the salt chlorinator based on one or more of
water hardness, water temperature, age of the salt chlorinator, or
flow rate.
11. A method of controlling operation of a sanitization system,
comprising: sensing water quality data corresponding to a body of
water to be sanitized; predicting a water quality trend based on
the sensed water quality data; and controlling operation of the
sanitization system based on the predicted water quality trend.
12. The method of claim 11, wherein the sensed water quality data
comprises one or more of a pH value, an ORP value, sunlight levels,
weather, bather load, turbidity, seasonality, alkalinity, cyanuric
acid, calcium hardness, or combined chlorine level.
Description
RELATED APPLICATIONS
[0001] The present application is continuation of U.S. patent
application Ser. No. 15/927,412, filed Mar. 21, 2018, which claims
priority to U.S. Provisional Application Ser. No. 62/474,333 filed
on Mar. 21, 2017, the entire disclosures of both of which are
expressly incorporated by reference herein.
BACKGROUND
Field of the Disclosure
[0002] The present disclosure relates generally to the field of
pool and spa equipment. More particularly, the present disclosure
relates to systems and methods for sanitizing pool and spa
water.
Related Art
[0003] Fluid sanitization systems have been provided in the past
for sanitizing pool and spa water. For example, assemblies for
sanitizing and/or disinfecting water have been developed. Fluid
(e.g., water) sanitization assemblies are useful in a myriad of
different environments for various uses/applications, such as
commercial and/or industrial applications. While such systems have
various features and advantages, there is a constant need to
improve the effectiveness of such systems. Accordingly, this and
other needs are addressed by the systems and methods for sanitizing
pool and spa water, of the present disclosure.
SUMMARY
[0004] Provided herein are systems and methods for sanitizing pool
and spa water. In one embodiment, an electrolytic chlorinator
(sometimes referred to herein as a salt cell) is provided which
includes a combined flow, temperature, and salt concentration
sensor. In another embodiment, the electrolytic chlorinator
includes an acid tank for in-situ cleaning of the electrolytic
chlorinator or acidification of pool/spa water where needed. In
another embodiment, a delayed polarity reversal technique is
provided for de-scaling and managing passivation of the blades of
an electrolytic chlorinator. In still another embodiment, the
electrolytic chlorinator includes a sacrificial anode for
protecting components of the chlorinator as well as other pool/spa
components. In yet another embodiment, the electrolytic chlorinator
includes an integral, electrically-controlled acid generator. In
another embodiment, the electrolytic chlorinator includes a brine
tank for periodically superchlorinating and/or shocking pool/spa
water. In still another embodiment, the chlorinator includes a
plurality of chemical tanks/feeds for periodically injecting
chemicals into the chlorinator. In another embodiment, a combined
ultraviolet (UV)/Ozone and salt (electrolytic) chlorine generator
is provided. In other embodiments, filters having integral UV
sanitizers are provided. In still further embodiments, reflective
linings are provided for UV sanitization systems. In another
embodiment, a UV/Ozone sanitizer having means for injecting bubbles
into pool/spa water is provided. In another embodiment, a system
for acquiring and analyzing samples of pool/spa water using an
unmanned aircraft (drone) is provided. Potential applications for
the technologies disclosed herein include, but are not limited to,
pools, spas, hot tubs, cooling towers, mister systems, secondary
and tertiary waste water, rainwater, drinking water, industrial
water treatment, aquaculture, and agriculture.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] The foregoing features of the disclosure will be apparent
from the following Detailed Description, taken in connection with
the accompanying drawings, in which:
[0006] FIG. 1 is a diagram illustrating an electrolytic chlorinator
having an combined flow and salt concentration sensor;
[0007] FIG. 2 is a diagram illustrating the combined flow and salt
concentration sensor of FIG. 1 in greater detail;
[0008] FIG. 3 is a diagram illustrating an electrolytic chlorinator
having an acid tank for in-situ cleaning of the chlorinator and/or
acid introduction into pool/spa water;
[0009] FIGS. 4A-4B are diagrams illustrating a delayed polarity
reversal technique in accordance with the system of the present
disclosure;
[0010] FIGS. 5A-5B are diagrams illustrating an electrolytic
chlorinator having an integral sacrificial anode;
[0011] FIGS. 6A-6B are diagrams illustrating an electrolytic
chlorinator having an integral, electronically-controlled acid
generator;
[0012] FIG. 7 is a diagram illustrating an electrolytic chlorinator
having a brine tank for shocking and/or superchlorinating pool/spa
water;
[0013] FIG. 8 is a diagram illustrating an electrolytic chlorinator
having a plurality of chemical tanks and/or feeders for
periodically introducing chemicals into the chlorinator;
[0014] FIG. 9 is a diagram of a conventional ultraviolet
sanitizer;
[0015] FIG. 10 is a diagram of a conventional ultraviolet/ozone
sanitizer;
[0016] FIGS. 11-12 are diagrams of an ultraviolet/ozone sanitizer
and electrolytic chlorine generator in accordance with the present
disclosure;
[0017] FIGS. 13A-13B are diagrams illustrating filtration systems
having integral UV sanitizers in accordance with the present
disclosure;
[0018] FIGS. 14A-14B are diagrams illustrating reflective inner
surfaces for UV sanitizers;
[0019] FIG. 15 is a diagram illustrating a UV/Ozone sanitizer
having bubble generation capability; and
[0020] FIG. 16 is a diagram illustrating a system for obtaining
samples of pool/spa water using unmanned aerial vehicles
(drones).
DETAILED DESCRIPTION
[0021] The present disclosure relates to systems and methods for
sanitizing pool/spa water, as described in detail below in
connection with FIGS. 1-16.
[0022] FIG. 1 is a diagram illustrating an electrolytic chlorinator
10 in accordance with the present invention. The chlorinator 10 can
operate with a pumping system of a pool and/or spa, and sanitizes
water of the pool and/or spa by converting salt within the water to
free chlorine via electrolysis. The chlorinator 10 includes a body
12, a combined flow, temperature, and salt sensor 14 that is
removably installed in an aperture 16 in the body and extends into
a chamber 18 of the body, a forward portion 20 which includes a
plurality of electrolytic plates 22, and ports 24, 26. It is noted
that the combined flow and salt sensor 14 is installed in the
aperture 16 in the general direction shown by the arrow in FIG.
1.
[0023] FIG. 2 is a diagram illustrating the combined flow,
temperature, and salt sensor 14 in greater detail. The sensor 14
includes a body 30 having a generally cylindrical outer wall 32 and
a peripheral shoulder 34, a chamber 36 that receives a circuit
board and/or electronics, potting compound 36 which encapsulates
the circuit board and/or electronics, a recessed portion 38, a
paddle wheel 40 which is at least partially positioned in the
recessed portion 38, and a plurality of electrodes (pins) 42. As
can be seen, 4 pins 42 are provided, but other quantities of pins
could be provided without departing from the spirit or scope of the
present disclosure. The paddle wheel 40 is in mechanical
communication with a flow meter forming part of the sensor 14, and
rotates whenever water flows past the sensor 14 to measure the rate
of water flow past the sensor 14.
[0024] The sensor 14 measures the salt concentration in pool/spa
water, as well as water's conductivity. Unlike 2-pin sensors, there
is no interference from `fouling` (e.g. scaling) and no calibration
is required for the sensor 14. The sensor 14 can be located inside
a salt cell (electrolytic chlorinator or other piece of pool
equipment--e.g. pump, heater, etc.). Locating the sensor 14 inside
a salt cell (or other pool equipment) eliminates the need for the
sensor to be plumbed somewhere else in the system. Also, it allows
the salt cell to intelligently know to shut itself off--it can do
this because a change of conductivity occurs when water stops
flowing and the gasses generated by the salt cell start to void the
cell of liquid. When the sensor 14 stops being surrounded by water,
the conductivity changes dramatically and can be detected and used
for salt cell control (to control the chlorinator 10).
[0025] The sensor 14 can be used for cell health monitoring and
diagnostics. The measured salt level from the sensor 14 can be
compared with a calculated salt level based on an algorithm
involving cell voltage, cell amperage and water temperature. In the
comparison between `measured` and `calculated` salt, it is possible
to discern how the salt cell is performing versus how it should be
performing--the difference can intelligently inform if the cell is
dirty (and needs to be cleaned) or if the cell is permanently
degraded (and how much lifetime remains). Another advantage of the
sensor 14 is that it can be used, in combination with the volume of
pool or spa water, to inform the user of the actual pounds (or
kilograms) of salt that needs to be added to the pool/spa in order
to raise the salt concentration to a target level. Further, the
salt concentration measured by the sensor can be compared to an
impedance of plates of an electrolytic chlorinator in which the
sensor is installed to determine a difference, and a condition of
the electrolytic chlorinator can be determined based on the
difference (which can be monitored over time).
[0026] The flow sensor of the sensor 14 can measure the presence of
flowing water and the actual water flow rate. Installation of flow
sensor in a salt cell or other piece of pool equipment (e.g. pump,
heater) eliminates the need for a separate flow switch to be
plumbed somewhere else in the system. The rotation of the paddle
wheel 40 can be bidirectional, permitting flow detection and
measurement in either flow direction. Magnets on the end of each
rotary vane of the paddle wheel 40 can be detected by electronics
in potted housing 36. The force required to rotate the paddle wheel
40 is very small, permitting detection of very low flow rates (e.g.
<10 GPM). The paddle wheel 40 is scalable and can be used in
small pipe and large pipe diameters (e.g. 1/2 inch pipe to 8 inch
pipe and beyond). Further, paddle wheel 40 eliminates failure modes
that falsely report flow. Calculation of pool turnover (i.e. how
many gallons of water was processed in a 24 hour period divided by
the volume of the pool) is also possible using flow measurements.
Calibration of pump RPM and pump energy consumption to the flow
rate for a given pool pad arrangement can also be performed,
allowing for the calculation of electrical energy used to operate
pool daily/weekly, annually, etc.
[0027] Additionally, calculation of optimal mixing and turnover
rates for improved chemical sensing and dosing algorithms (e.g.
prevent over oscillation) can be performed. A display could be
provided for displaying flow rate and historical flow rates in a
chlorinator (or a pump or a heater). Further, sensor 14 eliminates
filter schedules by filtering as long as needed to meet specific
water turnover goals and at the best energy level (e.g. run as slow
and as long as you allow the pool to run). The sensor 14 enables a
combination of flow rate (and flow history) with pump power sensing
to predict whether there is a system leak. If pool plumbing has a
significant leak then pump energy could decrease dramatically at
constant flow rate or pump energy could remain constant yet there
be a dramatic increase in flow rate. Additionally, the sensor 14
enables a combination of flow sensing and pump relay in order to 1)
build a hydraulic curve for the plumbing, 2) determine practical
maximum flow rate, 3) determine turnover schedule requirements, and
4) sense the filter media health. Still further, the sensor 14
enables a combination of flow sensing and certain controlled
equipment in order to dynamically set the correct flow to meet 1)
heater requirements when heating, 2) chlorinator needs when
chlorinating, 3) adequate mixing of dosed chemicals such as acid or
liquid chlorine when dosing.
[0028] FIG. 3 is a diagram illustrating another embodiment of the
sanitization system of the present disclosure, wherein an
electrolytic chlorinator (salt cell) 110 with periodic in-situ acid
cleaning capability is provided. In this embodiment, the
chlorinator 110 is fed acid from an acid tank 128 via tubing 129 in
fluid communication with a port 116 in the housing 112 of the
chlorinator. A `cell cleaning cycle` could be provided which
automatically injects some (or all of the acid) that is expected to
be needed (in a given week, for example) by the pool based on the
salt chlorinator runtime and pool size directly into the salt cell
to permit cleaning of scale from the salt cell. The system could
inject a small amount of acid directly into cell 110 just prior to
a pump turning on (e.g. 1 hour before), so as to take advantage of
the high acid level on the electrodes yet rinsing it clean after
this short exposure time. Alternatively, the system could inject a
small amount of acid directly into cell after the pump has turned
off to allow acid to soak inside cell and remove scale.
[0029] FIGS. 4A-4B are diagrams illustrating a polarity reversal
delay technique in accordance with the system of the present
disclosure. The polarity reversal technique allows for removal of
oxygen 134 from pores/cracks 138 in the surface 132 of a cathode
coating formed on a titanium electrolytic chlorinator blade 130
(which could include a layer of titanium dioxide 136). FIG. 4A
illustrates the condition of the blade 130 prior to polarity
reversal, and FIG. 4B illustrates the condition of the blade 130
after polarity reversal. Most salt cells are controlled in such a
way that the polarity is reversed at some frequency (e.g., every 1,
2, 3, 4, 8 hours) in order to allow for self-cleaning. The very act
of switching the polarity causes an anode to become a cathode and
vice versa. The chemistry switches also, because an anode has an
acidic surface environment (i.e., chlorine gas production) and the
cathode has an alkaline surface environment (i.e., hydroxide ion
production). This aids in self-cleaning as calcium scale will
precipitate on the alkaline cathode but gets dissolved by the acid
environment when it becomes an anode. Another aspect of polarity
reversal has to do with how much time delay, if any, occurs when
the polarity is switched. It is advantageous to build in a time
delay between the polarity switch (as opposed to a hard switch over
with no time delay) because the cathode also produces a small
amount of oxygen gas 134 that can combine with the underlying
titanium substrate 130 to form a passivated titanium oxide layer
136, which is non-conductive. The titanium passivation 136
(titanium converting to titanium dioxide) permanently prevents the
electrode from functioning. The act of introducing a time delay is
to allow the oxygen time to diffuse (convect) away so when the
electrode becomes energized again there is less oxygen present to
potentially form the oxide layer. A 1-minute delay between
switching (with switching occurring every 3 hours) has been found
to be sufficient, such that there is no detriment to overall
chlorine production with a few minutes of downtime per day. It is
possible that longer delays are better (e.g. 2 minutes, 4 minutes,
10 minutes) in that such delays would extend the life of the salt
cell. These longer delays could be factory set or adjustable in the
chlorinator control center by the end user.
[0030] Alternatively, a learning algorithm can be employed whereby
the monitoring of the output of the cell intelligently informs the
controller as to how long it is taking for the cell to become dirty
with scale. A controller can then decide as to the frequency of the
polarity reversals. For example, if the cell is not scaling much
(due to low hardness water), then the controller does not demand
polarity reversal every "x" hours. Instead, it learns how often to
reverse based on how quickly the cell is scaling.
[0031] FIGS. 5A-5B illustrate another embodiment of the
sanitization system of the present disclosure, wherein a
chlorinator 210 includes a sacrificial anode 229. The sacrificial
anode 229 could be attached to a plug 228 which inserts into an
aperture 216 formed in a housing 212 of the chlorinator 210, such
that the anode 229 extends into a chamber 218 formed in the
chlorinator 210. Water flows into the chamber 218 in the general
direction indicated by arrow B, past the sacrificial anode 229, and
past electrolytic plates of the chlorinator 210. Of course, it is
noted that flow direction could be reversed (in a direction
opposite arrow B), if desired. Sacrificial zinc anodes can be used
to help mitigate the galvanic corrosion damage done by stray
currents that may exist in the water due to insufficient equipment
bonding or insufficient pool grounding to earth. They can be also
used to prevent a battery-like environment created between two
dissimilar metals in contact with the conductive water (cathodic
protection). Sacrificial anodes are wearable items and, after
6-months, 1 year, 2 years or more, the anode will need to be
replaced as the zinc will have dissolved away. Zinc is used as
sacrificial anodes in marine application extensively (e.g. to
protect the hull of ships in salt/brackish water). Zinc happens to
have some algistatic properties as well so its dissolution is
desirable not only from the sacrificial anode standpoint but from
the aspect that it provide an algistat to the pool water.
[0032] FIGS. 6A-6B illustrate another embodiment of the
sanitization system of the present disclosure, wherein a
chlorinator 312 includes an integrated acid generator 329. The acid
generator 329 could be attached to a plug 328 which inserts into an
aperture 316 formed in a housing 312 of the chlorinator 310 (in the
general direction indicated by arrow C), such that the acid
generator 329 extends into a chamber 318 formed in the housing 312
of the chlorinator 310. The acid generator 329 could be powered by
a power supply 330 in electrical communication with the anodes 329.
Salt chlorine generators naturally cause an increase in the pH of
the water due to the net chemical reaction:
2NaCl+2H.sub.2OCl.sub.2+2NaOH+2H.sub.2. To counteract the pH
increase due to the sodium hydroxide production (i.e. NaOH), the
acid generator 329 generates an acid (i.e. protons--aka
H.sup.+--aka H.sub.3O.sup.+), and could be formed from a pair of
electrodes that can fit inside the chlorinator 310. The acid
generator 329 operates when the salt cell is operating in order to
neutralize the pH change. Alternatively, or additionally, the acid
generator 329 can be turned on just prior to the pump so the cell
can be soaked in acid and cleaned of scale. Alternatively, or
additionally, the acid generator 329 can be turned on after the
pump shuts off so the cell can be soaked in acid and cleaned of
scale. The acid generator 329 can be intelligently matched to the
salt cell operation so that the NaOH is precisely neutralized. The
acid generator 329 can also operate independent of the cell to
lower the pH of the pool water when desired.
[0033] FIG. 7 is a diagram illustrating another embodiment of the
sanitization system of the present disclosure, wherein a
chlorinator 410 is provided which is fed by a brine tank 428 in
fluid communication with the chlorinator 410 via a tube 429 to
provide for superchlorination when needed. The tube 429 is in fluid
communication with a port 416 formed in a housing 412 of the
chlorinator 410, such that brine is periodically injected into a
chamber 418 of the chlorinator 410. Pools and spas occasionally
require a shock of chlorine (aka-superchlorination) to oxidize
contaminants (e.g. organics, dead bacteria, metals, combined
chlorine)). Salt chlorine generators generally do not make good
superchloriantors because they generate chlorine too slowly. For
example, a typical salt generator will make 1-2 lbs of chlorine per
day but the superchlorination of a pool calls for raising the
chlorine level to 10 ppm rapidly. A 40,000 gallon pool would need
about 4 lbs of chlorine to raise it to 10 ppm (from 0 ppm) but that
cannot be done quickly with a salt system. In order to enable the
salt system to produce more chlorine, a higher salt level can be
used. Raising the salt level in the entire pool would be
undesirable. The brine tank 428 provides a high salt concentration
into the salt cell so the cell can make more chlorine without
needing to raise the salt level of the entire pool. The brine tank
428 (containing dissolved salt at a concentration similar to ocean
water--30,000 ppm--or even higher--up to saturation level of salt
in water at room temperature) is fed directly into the salt cell
while the flow rate through the cell is reduced (this is to keep
from diluting the introduced salt solution yet allowing flow to
carry away chlorine gas). The higher salt concentration will allow
the salt cell to make more chlorine and the salt cell can then
serve as a means of superchlorinating the pool/spa.
[0034] FIG. 8 is a diagram illustrating another embodiment of the
sanitization system of the present disclosure, wherein a
chlorinator 510 is in fluid communication with a plurality of
chemical feeders 528a-528c via fluid lines 529a-529c. The fluid
lines 529a-529c inject fluids from the feeders 528a-528c into a
chamber 518 formed in the housing 512 of the chlorinator 510. Many
different chemicals are available to add to pools to control water
quality issues such as high metals content, high phosphate levels,
high organic load, high or low pH, high or low alkalinity, low
cyanuric acid, low hardness, foaming, etc. All of these chemicals
can be introduced in liquid form into the port 516 of the
electrolytic chlorinator 512. The chemical types and their
functions could include, but are not limited to, the following:
TABLE-US-00001 Sequesterants Remove metals Chelating agents Bind
metals, bind cations (e.g. calcium) Defoamers Reduce foaming
Fragrances Improve water odor Acid (e.g. muriatic) Lower pH, lower
alkalinity Sodium carbonate solution Raise pH Sodium bicarbonate
solution Raise alkalinity Cyanuric acid Chlorine stabilizer Calcium
chloride solution Increase water hardness Sodium bisulfite solution
Reduce excess chlorine levels Sodium bromide solution Algicide
Hydrogen peroxide Oxidizer Metals solution (e.g. silver nitrate,
Algistat, algicide, bacteriostat, copper sulfate, zinc nitrate)
bacteriocide Chemical that acts as solar blanket Solar
blanket-keeps heat in water and on surface of the water prevent
heat escape Enzyme solutions Eats organic matter Phosphate removers
Reduces phosphate levels that can promote algae Algicides Prevent
or kill algae Liquid Chlorine Sanitizer and oxidizer
[0035] It is noted that a manifold could be constructed so that
multiple feed tanks can feed into the same port 516 on the
chlorinator 512.
[0036] FIG. 9 is a diagram illustrating a conventional ultraviolet
(UV) sanitization system, indicated generally at 600. UV, Ozone and
salt chlorine generation systems are all well-known methods to
sanitize pool water. These technologies can be employed
individually on a pool or spa in combination with each other. Some
systems have been reported that combine UV and ozone into a single
system using a UV lamp that serves as both the source of UV light
for water treatment and ozone generation for water treatment. One
example of such a system is shown in FIG. 10 at 700, which depicts
an ultraviolet sanitizer system 704 that has ozone generation
capabilities. Ozone is generated by the ultraviolet light of the
sanitizer system 704, is siphoned via a tube 706, and is fed into
pool/spa water to be treated using a venturi 702. Such systems
(shown in FIGS. 9 and 10) could be further modified to include a
salt chlorine generator, as indicated at 800 in FIG. 11. Such a
system 800 includes an ultraviolet and/or UV/Ozone generator 802,
and a salt chlorine (electrolytic) generator 806 in fluid
communication with the generator 802 by piping 804 and/or tubing
808. It is noted that the salt cell (i.e. chlorine generating
electrodes) can be placed directly inside the UV and/or UV/Ozone
vessel, if desired. The advantages may include a smaller equipment
footprint on the pool pad and the use of a single electronic
controller. Since neither UV nor ozone can be used as a stand-alone
sanitizer due lack of a lasting chemical residual, chlorine is
required with either a UV or UV/Ozone system-hence, integration
into a single product makes sense.
[0037] FIG. 12 is a diagram illustrating another embodiment of the
sanitization system of the present disclosure, indicated generally
at 900. In this embodiment, the sanitization system 900 includes an
ultraviolet/ozone (UV/O3) sanitization system 902 in fluid
communication with an electrolytic chlorinator 908. The
electrolytic chlorinator could be controlled by an electronic
controller 910. The UV/O3 sanitization system 902 could include a
venture assembly 904 which feeds ozone into water to be treated.
Such ozone could be supplied via a tube 906 which draws ozone
generated from ultraviolet lamps in the system 902. A big benefit
of using a UV and/or a UV/ozone and/or an Ozone generator with a
chlorine source for pool and or spa water treatment is that the
amount of chlorine needed can be much less-on the order of 50%
less. Due to the lower chlorine output needed, the end user has at
least 2 options when paring these systems with a salt water
chlorinator: reduce the operating time of an existing salt system
(say by 50% for example) and, as a result, extend the duration of
the use of a salt cell by a factor of 2, or, pair the UV, UV/Ozone,
or Ozone system with a LOW SALT chlorine generator. The lower salt
level will: 1) reduce the chlorine output of the salt chlorine
generator; and 2) will lower the risk for corrosion of pool
decking, pool equipment and poolside furniture. LOW SALT is defined
as being less than 2500 ppm, preferably less than 2000 ppm and most
preferably less than 1500 ppm.
[0038] FIGS. 13A-13B are diagrams illustrating another embodiment
of the sanitization system of the present disclosure. As shown in
FIG. 13A, the system 1000 includes a filter 1002 and an ultraviolet
sanitization system 1004 positioned within the filter 1002. A
manifold 1006 could control water flow through the filter 1002, and
could provide a mounting point from which the ultraviolet
sanitization system is suspended. As shown in FIG. 13B, the system
of FIG. 13A is expanded (indicated generally at 1100) to also
include an ozone feeder system that includes a venturi assembly
1108 and a tube 1110 for feeding ozone into water to be filtered.
The ozone could be supplied by an ultraviolet assembly 1104
positioned within the filter 1102 and suspended from a manifold
1106.
[0039] Manways or "manhole covers" can be placed on filter housings
for easy access to media servicing or replacement (e.g., as in sand
filters). The manway can serve as the access point for the
insertion of one or more UV lamps. The only requirement of the
final system is that the water is filtered prior to passing the UV
lamps--this is because UV works best when the water is clear.
Furthermore, filtered water is less likely to foul the glass sleeve
that is placed around the lamp.
[0040] FIGS. 14A-14B are diagrams illustrating ultraviolet
sanitization systems which include reflective liners. As shown in
FIG. 14A, the sanitizer 1200 includes an ultraviolet lamp 1204 and
reflective liner 1202 which reflects light into the sanitizer 1200
as indicated by arrows D. A conventional sanitizer 1300 is shown in
FIG. 14B, which lacks a reflective liner. As can be appreciated,
only direct light emanating from the lamp 1304 is available to
sanitize water, as indicated by arrows E. UV reflective surfaces
allow a portion of the UV light to return to the water column where
it can provide additional benefit in the way of microbial
inactivation. Some UV reflective materials that could be utilized
for the liner 1202 are listed below:
TABLE-US-00002 Material UV Reflectivity Plastic 10% Polished
stainless steel (SS) 30% Polished aluminum 60% Teflon (PTFE)
>99%
[0041] No system exists whereby a highly reflective coating (i.e.
greater than polished SS) has been added to the vessel wall of a
UV/ozone water treatment system. Such a system has the benefit of
the returned UV light to the water column where it can convert
ozone to hydroxyl radicals--or at the very least--destroy the ozone
so it does not return to the pool or spa where off-gassing of the
ozone can harm bathers
[0042] FIG. 15 is a diagram illustrating another embodiment of the
sanitization system of the present disclosure, indicated generally
at 1400, which introduces air or gas bubbles into water to be
treated. In this embodiment, the sanitization system 1400 includes
a combined UV/O3 sanitization system 1402, a venture assembly 1404,
and an external supply 1406 of air or another gas for sanitizing
water being fed into the system 1400. The addition of an air bubble
(irrespective of the gas composition in that bubble), causes the UV
light to reflect/diffract off the bubble surface thereby increasing
the mean path length through the water column before the UV hits
the reactor wall where the majority of its energy is lost as
heat.
[0043] FIG. 16 is a diagram illustrating another embodiment of the
sanitization system of the present disclosure, which includes an
unmanned aerial vehicle (UAV) or drone 1500 that can fly toward a
body of water such as a pool or spa 1512 (in the direction
indicated by arrow F) and periodically obtain a sample of water
1510 from the body of water. The drone 1500 could include a body
1502, propellers 1504 for propelling the drone 1500, and a water
sampling device 1506 for obtaining samples of the water 1510. The
drone 1500 could transport the sample of water to a testing
facility whereby the water is tested for various characteristics
such as water quality, pH, chlorine levels, bromine levels, etc.
Alternatively, the drone 1500 could include sensors for
automatically testing such characteristics on-board the drone 1500,
so that the drone need not fly to a testing facility.
[0044] For the vast majority of pool and spa owners, a proper water
analysis is conducted by the end user bringing a water sample to a
local retail or service store where specialized equipment is
available to evaluate the water quality. Water quality parameters
such as pH, free chlorine, total chlorine, combined chlorine,
bromine, calcium hardness, total alkalinity, total dissolved
solids, cyanuric acid, phosphate levels, metals (such as Fe, Mn, Cu
and Ag), and salt (i.e. sodium chloride), are commonly measured.
Many of these measurements are beyond the scope (and
affordability--as analytical equipment can be expensive for a
homeowner) of what is available to the consumer to perform at their
home. Most consumers, if they make measurement themselves will use
simple test strips or simple dropper kits. The tests trips measure
free chlorine, total chlorine, pH, total alkalinity, total
hardness, cyanuric acid and pH whereas the dropper kits typically
are limited to pH and free and total chlorine. The inconvenience of
bringing a water sample to a store can be alleviated by the use of
the drone 1500 which flies to the location of the pool and/or spa
and gathers a water sample. The drone is outfitted with a means to
gather and store a volume of water, typically 2 mL or more,
preferably 5 mL or more, and most preferably 10 mL or more. The
collected water sample can be brought back to a water testing
location for analysis or, given sufficient onboard sensors, the
drone could analyze the water, including temperature, at the point
of pick up. In either case, the results can be sent to the
homeowner or a service company for immediate action should any of
the water quality parameters fall outside of recommended
guidelines. The drone could be outfitted with GPS or equivalent to
locate the body of water. Furthermore, the drone can have onboard
sensors, protected from the elements within its housing, that
detect whether the pool or spa has a cover on it and whether or not
there are active bathers in the water. In the event of active
bathers, an audible alarm could warn of the impending water
landing, or alternatively, the drone can `reschedule` its visit or
manage to descend without approaching closer than 10 feet to a
bather. Finally, the drone can have communication capability (WiFi
or other) that allow it to be manually guided or rerouted as deemed
necessary by the sending party. We can imagine that the sender is
managing the flight of the drones in a manner similar to the
tracking of airline flights by air traffic control. Additionally,
the onboard communication of the drone can alert the end user (by
text or email) when it intends to be at their location and can then
communicate the results of its findings. On-board sensors could
also be part of the drone that enable it to test turbidity and
sense physical debris in the water, using cameras for example, so
it can alert appropriate parties as to the need for added
filtration or filtration maintenance as well as pool cleaning
services. The drone could direct an automatic pool cleaner to
certain top, side and bottom locations for debris removal as well
as instruct a pool automation system on filtration cycle
management, chlorination output, heater control, etc.
[0045] Additional features of could be provided in accordance with
the present disclosure as follows.
[0046] If a salt chlorine generator output varies with salt level,
water temperature, current supplied or other external variable,
then a fixed amount of chlorine per day can be maintained by
sensing chlorine generator amperage versus the amount of chlorine
generator runtime and then keeping the filter running (or
intentionally shortening its on-cycle) to match the targeted daily
chlorine dosage. A system could be provided wherein chlorine
generator production rate is modified with water temperature to
match higher chlorine demand in hotter water versus lower chlorine
demand in colder water. Such a system could combine amperage
utilization by chlorinator with pump schedule to predict chlorine
dose provided by the schedule. Further, such a system could modify
chlorine dosing (salt system or liquid or tablet chlorine feeder)
with weather reports and geographies (e.g. hot in AZ combined with
wind creates more dust in pool; anticipate temp at night to assess
overall chlorine demand).
[0047] In a salt chlorine generator, a system could be provided
wherein the generator modifies polarity reversal rates of the
chlorine generator based on water hardness, water temperature, age
of salt cell and flow rate.
[0048] Various smart sensing and control techniques could be
implemented in accordance with the present disclosure. For example,
such techniques could involve the use of predictive trends of water
quality data (e.g. pH trend line) to determine dosing regimen
rather than simple timeout features (Example of old method: Acid
feeder is activated due to high pH. After several hours the pH
target still not met so a timeout alarm is used to stop what may be
a bad pH probe and overdosing of acid. Example of new method: Acid
feeder is activated due to high pH. After several hours the pH
target still not met but the pH trend line is going as expected and
so dosing continues). Such a method eliminates false alarms and
inconvenient timeouts. Additionally, the system could
modify/compensate ORP set point with measured pH value. Since ORP
drops as pH increases, a potential exists to continue adding
chlorine when in fact ORP only dropped due to pH and not due to
insufficient chlorine. The issue of falling ORP with rising pH is
currently problematic with salt chlorinators managed by ORP sensing
because the pH will rise as the chlorine generator operates,
causing a lowering of the ORP and the potential for the ORP not to
hit its set point, calling for more chlorine when in fact there is
plenty. Still further, the system could modify/compensate ORP set
point with sunlight. UV/visible rays have a pronounced effect on
ORP if cyanuric acid is used. For example, at the same chlorine
level, water exposed to darkness will have a higher ORP than the
same body of water exposed to sunlight (because cyanuric acid will
bind the chlorine more tightly in the sun--has to do with the
binding strength between the chlorine molecule and cyanuric acid
molecule as a function of UV/visible light).
[0049] The system could also be embedded with a reminder system in
the equipment (chlorinator, pump, etc.) to recommend manual water
tests. A calculator/wizard could be used to recommend ORP set
points and chlorine dosing based on manual water tests. Further,
the system can calculate acid needed to offset pH rise when using a
salt chlorinator as a function of water chemistry parameters,
chlorinator runtime, geography and weather reports. For example,
the pH rise in a given week/month associated with specific
chlorinator usage can be predicted for a given pool given its
volume and water chemistry. If however, acid rain occurs, the need
for additional acid may be nil in any given period. Other water
parameters that could be sensed include alkalinity, cyanuric acid
levels, and calcium hardness levels.
[0050] Additionally, further improvements can be made to salt
chlorinators in accordance with the present disclosure, as follows.
Salt chlorine generators typically are designed to shut off when
the water flow stops. That is, they are controlled by a flow switch
that triggers the shut off. In doing so, a high concentration of
chlorine exists inside the cell which can diffuse upstream and
chemically attack heaters and other pool equipment. For this
reason, a check valve is often used upstream of the chlorinator to
prevent this backflow. A better solution is to simply have the
chlorinator shut off 1 or 2 minutes before the pump--in this way,
the salt cell has been flushed of the high concentration of
chlorine and only normal pool water chlorine levels exist inside
the cell-therefore no check valve is needed. Note that the volume
of a salt cell is small compared to the volume of water flowing
through it so only a few seconds of `flushing` is needed after the
cell shuts off.
[0051] The systems of the present disclosure could also include the
ability to predict the need to shock or superchlorinate a pool or
spa. Shocking or superchlorination of pool water is periodically
required to oxidize bather waste. The system can anticipate the
need to shock based on weather (e.g. sunlight, rainfall), bather
load, turbidity, seasonality and combined chlorine level.
[0052] Additionally, in accordance with the present disclosure, the
various UV/Ozone systems disclosed herein could also be modified to
function as bromine generators. Bromine is commonly used in hot
tubs because it does not form bromamines, unlike chlorine which
forms malodorous chloramines. Bromine can be added to a hot tub by
1) bromine tablets, 2) by the generation of bromine using a salt
bromine generator (starting with NaBr instead of NaCl as is done
with chlorine) or 3) by generating the bromine in situ using ozone
(a strong oxidizer) to convert bromide salt to bromine (Note: ozone
will convert bromide to bromine. Bromides are introduced into hot
tub as the NaBr salt). The hydroxyl radicals generated from a
UV/Ozone system can be used to convert the bromides salt to
bromine. The use of a UV/Ozone system not only regenerates bromine
form the bromide ions but it reduces the amount of bromine needed
to the overall sanitizing and oxidizing power of the UV/Ozone
combination.
[0053] Still, further, in accordance with the present disclosure,
pool lights or wall fittings can serve as turbidity and bather
sensors. A pool light by definition is a transmitter of light. A
pool light or wall sensor that contains a `light receiver` can be
calibrated using `clear` water and the change in light intensity
can be used to monitor the presence of bathers and/or changes in
the turbidity of the water.
[0054] Having thus described the invention in detail, it is noted
that the foregoing description is not intended to limit the spirit
or scope of the present invention. Accordingly, what is desired to
be protected by Letters Patent is set forth in the following
claims.
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